[Prev][Next][Index][Thread]

Re: Final test on new TC

Subject: 
        Re: Final test on new TC
  Date: 
        Wed, 26 Mar 1997 00:36:31 -0500 (EST)
  From: 
        richard hull <rhull-at-richmond.infi-dot-net>
    To: 
        Tesla List <tesla-at-pupman-dot-com>


At 07:56 PM 3/24/97 -0600, you wrote:
>Subject: 
>            Final test on new TC
>       Date: 
>            Sun, 23 Mar 1997 16:17:33 -0800
>       From: 
>            Skip Greiner <sgreiner-at-wwnet-dot-com>
>Organization: 
>            Greiner, Ltd.
>         To: 
>            tesla list <tesla-at-pupman-dot-com>
> References: 
>            1 , 2
>
>
>Hi Everyone
>
>Here are the final specs and test results on my new coil. Since this
>coil has a somewhat different aspect ratio than most, I thought you
>might be interested
> 
> Sec: 17.5" x 24" (D x H), 192 turns #16 ga stranded machine tool wire
> 
> Pri: 23" dia. solenoid wound. 6 turns .375" copper tubing spaced .25"
> 
> Cap: .014uf
> 
> Toroid: 5.5" X 28"
> 
> Input: 15kv -at- 60ma, 900va
> 
> Gap: sync rotary, 1800rpm, 4 gaps, 1 closure per each 1/2 cycle,
>120/sec
> 
> Sec Fr with no toroid: 350khz
> 
> sec Fr with toroid: 263khz.
> 
> k: .19 with sec mounted 4" above top turn of primary
> 
> Discharge length: 48" to 56" with occasional jumps to 60"
>
> Due to the shortness of the secondary, no strike rail is required.The
> cap and tranny are in very close proximity to the primary and they do
> not take any hits from the toroid either. They are nearly at the same
> level as the primary.
> 
>For the first time I have witnessed what R. Hull refers to as synergy. I
>never have been able to get the discharges to emanate from the purposely
>placed bump on the toroid. I always seemed to have multiple discharges
>which rotated around the toroid but never concentrated at one spot. In
>this particular instance I achieved what appeared to be pretty good tune
>between the primary turns, cap and toroid size.At this point I started
>to decouple the secondary by raising it .75" at a time. Interestingly
>with the secondary almost exactly 4" above the primary the discharges
>became concentrated at the bump on the toroid. .75" above or below this
>point caused the discharges to again split up and rotate around the
>toroid. Also at this coupling the primary tuning became very sharp. Plus
>or minus one turn reduced the discharges by almost 1/2. Changing the
>size of the toroid also reduced the discharge length. *This is synergy.*
>Another interesting point: my safety gaps are set to only about .25" yet
>they never fire when the coil is tuned as described.
>
>Next step: onward to 1.8kw, 15kv-at-120ma. Who knows, maybe 72" with 1.8kw.
>I think that to achieve tuning with a larger primary cap I will have to
>rewind the secondary with a smaller diameter wire, or maybe a wire with
>thinner insulation.
>
>Skip
>
>Skip,

Glad to hear you got the "feel" for system synergy.  A good coil and
system
can always benefit from ultra careful coupling adjustment with the
toroid in
place.  We had to do it with Nemesis and it was hyper critical too, as
in
your case.  The coupling ultimately settled in with the 60" toroid
around
K=.25.  We have the whole process on tape as we also lifted the big 100
lb
secondary and terminal up in .5" increments until the optimal point was
found.  I'm looking forward to hearing more about your low power
successes.
Very good work, indeed!

Richard Hull, TCBOR